Megajoule (MJ)
Exactly one million joules.
What is a megajoule?
- Symbol
- MJ
- Quantity
- Energy
- Unit system
- SI
- Definition
- Exactly one million joules.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used for fuel energy content, explosive yield and large-scale energy accounting.
Megajoule in other energy units
- 1 MJ = 1000000 JJoule
- 1 MJ = 1000 kJKilojoule
- 1 MJ ≈ 277.7777778 WhWatt-hour
- 1 MJ ≈ 0.2777777778 kWhMegajoule to Kilowatt-hour converter
- 1 MJ ≈ 239005.7361 calCalorie (thermochemical)
- 1 MJ ≈ 239.0057361 kcalKilocalorie (thermochemical)
- 1 MJ ≈ 947.8171203 BTUBritish thermal unit (IT)
- 1 MJ ≈ 737562.1493 ft·lbfFoot-pound-force
- 1 MJ ≈ 6.241509074e+24 eVElectronvolt
- 1 MJ = 10000000000000 ergErg
Megajoule quick reference
| Megajoule | Kilowatt-hour | Kilojoule | Kilocalorie (thermochemical) |
|---|---|---|---|
| 1 MJ | ≈ 0.2777777778 kWh | = 1000 kJ | ≈ 239.0057361 kcal |
| 10 MJ | ≈ 2.777777778 kWh | = 10000 kJ | ≈ 2390.057361 kcal |
| 100 MJ | ≈ 27.77777778 kWh | = 100000 kJ | ≈ 23900.57361 kcal |
| 1000 MJ | ≈ 277.7777778 kWh | = 1000000 kJ | ≈ 239005.7361 kcal |
Where the megajoule fits
The next smaller energy unit is the kilocalorie (kcal). 1 MJ ≈ 239.0057361 kcal, and 1 kcal = 0.004184 MJ.
The next larger energy unit is the kilowatt-hour (kWh). 1 MJ ≈ 0.2777777778 kWh, and 1 kWh = 3.6 MJ.
Frequently asked questions
- How many kilowatt-hours are in one megajoule?
- One megajoule ≈ 0.2777777778 kWh (kilowatt-hours).
- How many kilojoules are in one megajoule?
- One megajoule = 1000 kJ (kilojoules).
- How many kilocalories are in one megajoule?
- One megajoule ≈ 239.0057361 kcal (kilocalories).